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Home >> Mazda >> 1995 >> MX-3 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Fuel Delivery >> Pressure Regulator Control

Pressure Regulator Control

  1. Engine must be at operating temperature (150°-200°F (66°-93°C)) and ambient temperature must be high. Turn engine off. Disconnect vacuum hose at fuel pressure regulator and connect a vacuum gauge to hose.
  2. Without touching throttle, start engine. Observe vacuum gauge. Vacuum should not exist for a period of 1-3 minutes. If vacuum is present, check vacuum routing, pressure regulator control solenoid, and related circuits.
  3. If vacuum gauge shows intake manifold vacuum after specified amount of time, system is okay. See Figure . If intake manifold vacuum is not present after 3 minutes, check vacuum source, pressure regulator control solenoid and related circuits.
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